Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) /* SPDX-License-Identifier: GPL-2.0-only */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  *  linux/drivers/acorn/scsi/msgqueue.h
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  *  Copyright (C) 1997 Russell King
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7)  *  message queue handling
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) #ifndef MSGQUEUE_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #define MSGQUEUE_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) struct message {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)     char msg[8];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)     int length;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)     int fifo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) struct msgqueue_entry {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)     struct message msg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)     struct msgqueue_entry *next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #define NR_MESSAGES 4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) typedef struct {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26)     struct msgqueue_entry *qe;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)     struct msgqueue_entry *free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)     struct msgqueue_entry entries[NR_MESSAGES];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) } MsgQueue_t;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32)  * Function: void msgqueue_initialise(MsgQueue_t *msgq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33)  * Purpose : initialise a message queue
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34)  * Params  : msgq - queue to initialise
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) extern void msgqueue_initialise(MsgQueue_t *msgq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39)  * Function: void msgqueue_free(MsgQueue_t *msgq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)  * Purpose : free a queue
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41)  * Params  : msgq - queue to free
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) extern void msgqueue_free(MsgQueue_t *msgq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46)  * Function: int msgqueue_msglength(MsgQueue_t *msgq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47)  * Purpose : calculate the total length of all messages on the message queue
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48)  * Params  : msgq - queue to examine
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49)  * Returns : number of bytes of messages in queue
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) extern int msgqueue_msglength(MsgQueue_t *msgq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54)  * Function: struct message *msgqueue_getmsg(MsgQueue_t *msgq, int msgno)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55)  * Purpose : return a message & its length
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56)  * Params  : msgq   - queue to obtain message from
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57)  *         : msgno  - message number
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58)  * Returns : pointer to message string, or NULL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) extern struct message *msgqueue_getmsg(MsgQueue_t *msgq, int msgno);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63)  * Function: int msgqueue_addmsg(MsgQueue_t *msgq, int length, ...)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64)  * Purpose : add a message onto a message queue
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65)  * Params  : msgq   - queue to add message on
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66)  *	     length - length of message
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67)  *	     ...    - message bytes
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68)  * Returns : != 0 if successful
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) extern int msgqueue_addmsg(MsgQueue_t *msgq, int length, ...);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73)  * Function: void msgqueue_flush(MsgQueue_t *msgq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74)  * Purpose : flush all messages from message queue
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75)  * Params  : msgq - queue to flush
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) extern void msgqueue_flush(MsgQueue_t *msgq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) #endif